Correct

绝唱

/ juéchàng / 
Strokes

Definition

most perfect song

Example

As a Noun

peak/acme of perfection

1
Qiāngǔjuéchàng
千古绝唱

poetic masterpiece through the ages

As a Noun

last song of a singer; swansong

2
Xiǎngbudào
想不到
zhè
这
jìng
竟
chéng
成
le
了
tā
她
de
的
juéchàng
绝唱
  
。

I didn't expect it to be her swansong.